Dobby-chain.



W. B. HARRIS.

DOBBY CHAIN.

APPLICATION FILED FEB. I9. 1915.

1 ,199,546 Patented Sept. 26, 1916.

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fnvcn'ov it tovnoy jso WARREN IB. HARRIS, 0F MILLBURY, MASSACHUSETTS.

DOBBY-GHAIN.

Specification of Letters Patent.

Patented Sept. 26, 1916.

Application filed February 19, 1915. Serial No. 9,424.

To all whom it may concern:

Be it known that I, WARREN B. HARRIS, a citizen of the United States,residing at Millbury, in the county of lVorcester and Commonwealth ofMassachusetts, have invented a new and useful Improvement inDobby-Chains, of which the following, together with the accompanyingdrawings, is a specification.

The present invention relates to an 1mproved construction for dobby orpattern chain, such as is used in various types of weaving machinery forcontrolling the pattern of the cloth being made by the machine.

The features of the invention are fully set forth in the followingdescription and pointed out in the annexed claims, reference being hadto the accompanying drawings, in which Figure 1 is a plan view of ashort section of chain made in accordance with my invention. Fig. 2 is asection on line 22, Fig. 1, and Fig. 3 is a plan view of a single linkor bar of chain of a slightly different type, showing the application ofmy invention thereto.

Similar reference characters refer to similar parts in the differentfigures.

The ordinary types of dobby or pattern chains comprise a series ofpivotally connected links, in the form of more or less elongated woodenbars, arranged side by side, with their longitudinal edges opposing, andtheir corresponding ends in alinement. It is common practice to connectadjacent bars of the series by a short chain link at each end, said linkbeing attached to suitable eyelets projecting from the opposing edges ofadjacent bars. An ordinary expedient for conveniently forming andattaching such eyelets consists in inserting a wire transversely throughthe bar at each end, and then looping each free end of said wire aroundinto substantial contact with the edge of the bar, thereby forming twoeyes from a single wire, the centers of which are in alinement with theline of travel of the chain and are slightly offset from the centraltransverse portion of the wire which is embedded in the bar.

An objection to eyelets formed in the manner above described is found inthe tend ency of the wire to twist around in the bar; this results in adisplacement of the eyelets of one bar from alinement with the eyeletsof adjacent bars, causing said bar to shift longitudinally with respectto the other bars, and thereby prevent the accurate traverse of thechain over its drums.

My invention contemplates the elimination of the ditficulty above setforth, by providing a construction in which the wires are prevented fromturning in the bars, and the same will now be described with particularreference to the drawings.

The bars 1, l of the chain shown in Figs. 1 and 2 are of the ordinaryform of single index chain bars, each presenting a single row of holes2, 2 for the insertion of pins 3, 3 which determine the pattern of thecloth in the usual manner. The drums, not shown, over which the chainpasses at each end of its traversing movement, afford longitudinalgrooves on their peripheries, of the same cross-sectional shape as thebars and spaced apart the same distance as adjacent bars of the chain;to facilitate the entrance and exit of the bars to and from saidgrooves, the longitudinal side walls of the grooves are beveled, and thelongitudinal side edges 4:, 4 of the bars are correspondingly beveled,converging toward the under face of the bar,

2'. 6., the face which moves into contact with the peripheries of thedrums.

At each end of each bar 1 a wire 5 is inserted transverselytherethrough, and said wire projectsoutwardly from each inclined sideedge 4 of the bar a sufficient distance to enable the end of the same tobe looped around to form an eyelet. The end of the wire 5 projectingfrom one side edge 4 of the bar is given a slight lateral deflection oroffset, as shown at. 6, and the other end of said wire, projecting fromthe other side edge are given the same offset in the opposite direction,as shown at 7. The two free ends of the wire are then looped around indirections opposite to their respective offsets, and therefore inrelatively opposite directions to each other, into. contact with thesurface of their corresponding side edges, to form eyelets 8 and 9respectively. By reason of the offsets 6 and 7 the centers of the twoeyelets 8 and 9 are caused to coincide with the axial line of thestraight central portion of the wire 5 which is embedded in the bar 1.All the bars of the chain are thus provided with eyelets 8 and 9 at eachend; the chain is assembled, as shown in Fig. 1, by connecting opposingeyelets of adj acent bars by short links 10, in the usual manner.

It will be seen, that by reason of the opposite inclination of the sideedges 4, l of a bar, the contact therewith of the oppositely bent freeends of the wire 5 precludes any tendency of the eyelets thus formed toturn about the axis of the straight central portion of the wire; takingan eyelet 8, for example, the tendency of the same to twist in aclockwise direction, Fig. 1, is resisted by the body of the bar 1interposed, by reason of the in clination of the edge 4, in the way ofthe extreme end of the wire forming such eyelet, and its tendency totwist in the opposite direction is prevented in the same way by theinability of the extreme end of the eyelet 9 oi the same wire to turnfarther in this opposite direction.

Referring to Fig. 3, the bar 11 therein shown is of the double indextype, presenting the rows of staggered holes 12, 12 for the reception ofthe pattern pins. Owing to the very small distance, measuredlongitudinally of the bar, between holes in diiterent rows, greatdifficulty is experienced in passing a wire at right angles through thebar, without breaking into one of the holes 12 on either side of thesame. I propose to dispose the wires 13 at oblique angles to thelongitudinal axis of the bar, as shown in Fig. 3, thereby givingconsiderable clearance between said wires and the holes 12, 12 on eachside thereof. This arrangement is peculiarly adapted to the carrying outof my invention with respect to the looping of the free ends of eachwire in opposite directions, since no ofisetting or deflection of thewire emerging from the beveled side edges 14, ll of the bar is required,in order to bring the centers of the eyelets 15 and 16 thus formed, intoalinement with each other and with the line of movement of the chain.

It will be clear that a chain having bars made in the manner justdescribed, and connected up with the ordinary links 17 possesses thesame advantages of operation as the chain shown in Fig. 1.

I claim,

1. In a device of the character described, a series of linked barshaving oppositely beveled edges, each bar having a member extendedtherethrough and bent into eyelet form at each end, the free ends ofsaid member terminating in substantial contact with the adjacent edgesof the bar on opposite sides of the axis of said member.

2. In a device of the character described, a series of linked barshaving oppositely beveled edges, each bar having a member extendedtherethrough and bent into eyelet form at each end, the free ends ofsaid member terminating on opposite sides of the axis of said member,and in substantial contact with the adjacent edge of said bar.

3. In a device of the character described, a series of linked barshaving oppositely beveled edges, each bar having a member extendedtherethrough, with the free ends of said member bent around, in oppositedirections, into substantial contact with the adjacentedge of the bar.

a. In a device of the character described, a bar providing oppositelybeveled edges,

and a member extended through said bar.

and projecting from each of said edges, the

free ends of said member being bent around into substantial contact withtheir adjacent edges on opposite sides of the axis of said member.

5. In a device of the character described, a 'bar providing oppositelybeveled edges,

having a member extended therethrough and bent into eyelet form at eachend, said beveled edges of the bar cooperating with the free ends ofsaid member to prevent the turning of said member in the bar.

6. In a device of the character described,

a bar providing oppositely beveled edges,

and a member extended obliquely through said bar, and projecting fromeach of said edges, the free ends of said member being bent around inreverse directions into contact with the adjacent beveled edges of thebar to form eyelets.

7. In a device of the character described a series of bars adapted to belinked to gether, each bar having a member extended obliquelytherethrough and bent in reverse directions into eyelet form at eachend, the free end of said member terminating on opposite sides of theaxis of said member and in substantial contact with the adjacent edge ofsaid bar.

IVARREN B. HARRIS. \Vitnesses PENELOPE CoMBERBAon, NELLIE IVHALEN-Copies of this patent may be obtained 01- five cents each, by addressingthe Commissioner of Patents,

Washington, 1). C.

